Traditional cameras need film, why don't digital cameras need it?

Traditional cameras need film, digital cameras do not need, this is because their imaging principle is not the same, storage imaging medium is not the same as the difference.

A traditional camera imaging principle and storage media.

Traditional camera is the use of light-sensitive film anti-scene photographic equipment.

Traditional cameras are required to use to the camera external access media, that is, film, film is a chemical reaction method to record the external image, film is its image carrier.

After inserting the film into a fixed position in the camera, the film preserves the image of the outside scene through the light-sensitive reaction of the lens.

Film must be developed in a darkroom, using certain liquids, and requires the mastery of certain techniques, which are directly related to the quality of the finished photograph.

The film has to be developed to produce a photo, which is finalized and cannot be changed.

Compared with the traditional camera and digital camera, the big disadvantage is that it can not know the shooting process, and can not be deleted from the shooting photos.

Because it costs more to use one film for one shot.

Two, digital camera imaging principle and storage media.

Digital camera, is a camera that uses an electronic sensor to convert optical images into electronic data.

Digital camera is a set of optical, mechanical and electronic integration of products. It integrates the conversion, storage and transmission of image information and other components, with digital access mode, interactive processing with computers and real-time shooting and other characteristics.

The storage medium of digital camera is memory card, which can be viewed, deleted, modified and recorded through instant impact on photos.

Digital camera is based on electronic technology, it is not using light-sensitive reaction and imaging, not a chemical reaction, so it does not need to use film.

Because it can instantly know the original photo, can be edited, and do not have to print out, and, memory cards can be reused, so it is more convenient than traditional cameras, it slowly replaced the traditional camera.